水稻三系不育系檀香A和粮香A的选育及特征特性研究OA

Tanxiang A and Liangxiang A are high-quality three-line male sterile lines of rice bred by Hunan Agricultural University.Tanxiang A was developed by selecting a maintainer line from a cross between Taifeng B and Shengtai B,followed by backcrossing with Wanxiang A as the cytoplasmic source.Liangxiang A was obtained by test-crossing and continuous backcross transformation with Taonong 1A as the female parent and an improved line of Guang 8B/Taifeng//Hengfeng B as the male parent.To further explore their production and application values,This study used Taifeng A as the control to investigate its main agronomic traits and outcrossing characteristics.The results showed that Tanxiang A had a shorter growth period,stronger tillering ability,taller plant height,and more effective panicles than the control.Liangxiang A had a longer growth period,longer upper three leaves,weaker tillering ability,shorter plant height,and superior panicle yield traits compared to the control.In terms of outcrossing characteristics,Tanxiang A featured concentrated flowering time,better glume-opening habit,higher stigma exsertion rate,and stronger stigma viability than the control,demonstrating potential for high-yielding seed production.Liangxiang A had a higher rate of non-closed glumes,significantly shorter glume-opening duration,and higher necked-grain rate than the control,with a faster decline in stigma viability,showing slightly poorer outcrossing characteristics than the control.